Boring and grinding attachment for hollow-spindle lathes.



F. T. REID. BORING Ml'D GRlNDING ATTACHMENT FUR HOLLOW SPINDLE LATHES.

APPLICATlON FILED JAN-22,1915- Patented Dec. 5,1916.

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specification of ltctters Patent.

Application filed January F52, 1915. Serial l lo. 3,?32.

To all whom it may concern."

Be it known that 1; Fans T, REID, a citizen of the United States,-and a resident of Hartford, in the county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Boring and Grinding Attachments for Hollow-Spindle Lathes, of which the following is a specification.

The object of this invention is to provide an attachment which may be utilized with any of the common forms of hollow spindle lathes, and which can be used for boring and grinding automobile cylinders, and silili'lar parts, although it is particularly well adapted for the work specified.

In the drawingsFigure 1 is a longitw dinal section of the attachment. Fig. 2 is an end View thereof. Fig. 3 shows detached views of the boring tool.

To the end of the hollow spindle, which is customarily provided with an exterior screw thread, there is mounted a face plate (It, having the dovetailed groove 7) in its front surface to receivethe sliding block 0 on which the hollow arm 03 is mounted.-

When the attachment is used for boring, the

turning tool 8 shown in Fig. 3 is secured to the end of the arm by the screw threads, and by the adjustment of the cutter f in its holder, and the adjustment of the block 0 in the face plate a through the medium of the screw 9 operated by the hand wheel k, the cutter can be brought into proper wort-- ing relation with the interior of the cylinder, and the rotation of the spindle carrying the complete attachment produces the proper and necessary motion of the cutter. When grinding is to be done, the cutting; tool is removed from the spindle, and a shaft 10 inserted from the end of the hollow arm and passed back through the spindle, and at its rear end is provided with a pulley 11 or some other suitable driving means. This shaft is supported by a hear ing 12 in the face plate a, by a bearing 18 in the arm (Z, and the tapered end of the shaft is supported in the tapered bearing 14 at the end of the arm at, the adjusting" and lock nuts 15 providing for the proper assembly of these taper hearings, the set screws 16, l6. unitin e; the hearings with the arm. Thecap 1'4 closes 1n the end at the arm and acts a dust cap. The shalt 10 li 'atented lllecn 5 ltdil grinding device about the surface to he acted upon.

The ordinary feed screw of the lathe, or

other appropriate part, can be utilized to move the cylinder and tool longitudinally relative to one another in order to cover the entire surface of the work.

This attachment has been designed to provide a very efficient turning and grind ingtool which. can he made and sold at a reasonable price. to be attached to a standard type of machine, namely, a hollow spindle lathe such as are to he found in the equipment of most small machine shops and garages. It provides the automobile repair 'man at a very small expense with a tool with which he can produce very accurate and satisfactory work of a kind for which there is a. very large demand, and thus avoid the necessity of installing a complete special machine with special tools and fixtures at large cost.

It is possible that the device as here illus* trated and described is susceptible of modification and alteration without departing from the spirit of the invention as set forth in the appended claim.

ll claim as my invention The combination with a lathe provided with a hollow spindle, of grinding attachment adapted to be secured to said hollow spindle, comprising a base mounted upon and for rotation with said spindle. the outer face of the hasehavinc; parallel dove-tailed flanges, a block havinp; parallel dove-tailed walls slidahly mounted beneath the base flanges for transverse movement in a plane at right angles to the longitudinal axis of the hollow spindle, a screw journaled on the base plate with the end thereof in engagement with the slidingblock for holding the block in adill tfidpositions, a hollow arm secured at one of its ends to the front oi Said sliding block, a shaft estendi qthrough 'saidg' arm and spindle, a universal joint ed on said shaft beyondithefend of said hol- ,within said hollow arm dividing the same into three sections, removable bearings for l 1 said shaft adjacent each end thereof, a tool Witnesses:

forminga, portion of that part of said shaft low spindle.

FRED '1. REID.

mountedon said-shaft beyond the end of v H. E. HART, said hollqw arm, and driving means'mount- A. OBRIEN. 

